2 6-11 3-7 3-6 1.5-3.3 Light Breeze Wind felt on exposedskin.
0000058204 00000 n 1 1-5 1-3 1-2 0.3-1.5 Light Air Wind motion visible in smoke. On the [YUe��/��"�r��9)���]�X]��)� �A���2�f�ۦ�Q_NB��bi��6'���D�(|Di�*[�g�+o�no᭞�y�. heavy and shock-like.
Beaufort Number (Force) Wind speed km/h mph kts m/s Description Land conditions Visual 0 <1 <1 <1 <0.3 Calm Calm. 0000005929 00000 n Crests of waves begin to
froth.
Small wavelets (0.2 m). wind.
0000046873 00000 n
startxref Probably some spray. 0000002617 00000 n
Somewhat arbitrarily, he identified 13 states of wind force on his vessel and ranked them 0 to 12. 12 73-83 64-71 Hurricane The air is filled with foam and
0000017217 00000 n Whole trees in motion, inconvenience in walking. Visibility 0000050580 00000 n The scale was developed in 1805 by Francis Beaufort, an officer of the Royal Navy and first officially used by HMS Beagle.. 0000058432 00000 n
appearance.
0000000016 00000 n Twigs and small branches Crests 0000005270 00000 n High waves (7 m), dense foam, visibility affected.
0000002079 00000 n Mounting sea (4 m) with foam blown in streaks downwind. all public domain share and share alike places - no copyrights as far as we can find... the scales history is here on wikipedia.org. Large branches move, wires whistle, umbrellas are difficult waves). The sea is completely 9 47-54 41-47 Severe Gale High waves. white foam crests are more Developed in 1805 by Sir Francis Beaufort, U.K. Royal Navy 2 4-7 4-6 Light Breeze Small wavelets, still short,
The Weather Legacy of Francis Beaufort — The history of the Beaufort Scale. breakinto spindrift.
The foam is Smoke rises vertically. Actually, the Beaufort scale goes all the way to 17, but the last five numbers only apply to tropical typhoons.
seriously affected. These numbers are only used in the areas around China and Taiwan.
3 8-12 7-10 Gentle Breeze Large wavelets. Beaufort Wind Scale. Internationally, WMO Manual on Marine Meteorological Services (2012 edition) defined the Beaufort Scale only up to force 12 and there was no recommendation on the use of the extended scale. blown in well-marked streaks Very high waves (9 m), heavy sea roll, visibility impaired. The scale was devised in 1805 by the British naval Commander, later Admiral, Sir Francis Beaufort (1774-1875). 0000035308 00000 n 8 39-46 34-40 Gale Moderately high waves of greater foam, in great patches, is blown along the direction of the wind. Beaufort Scale Chart: Beaufort: Avg miles per hour: Avg km per hour: Knots: Surroundings: 0 (calm) 0: 0: 0-1: Smoke rises vertically and the sea is glassy or mirror smooth: 1 (light air) 1.2-3: 2-5: 1-3: Smokes moves slightly with breeze and indicates the direction of wind: 2 (light breeze) 3.7 – 7.5: 0000043142 00000 n 5 19-24 17-21 Fresh Breeze Moderate waves, taking a more reduced, Exceptionally high waves; sea covered with white foam patches; visibility further reduced, Air filled with foam; sea completely white with driving spray; visibility greatly reduced. 0000002216 00000 n 7 32-38 28-33 Near Gale Sea heaps up and white foam Ripples with appearance of scales; no foam crests, Small wavelets; crests of glassy appearance, not breaking, Large wavelets; crests begin to break; scattered whitecaps, Small waves, becoming longer; numerous whitecaps, Moderate waves, taking longer form; many whitecaps; some spray, Larger waves forming; whitecaps everywhere; more spray, Sea heaps up; white foam from breaking waves begins to be blown in streaks, Moderately high waves of greater length; edges of crests begin to break into spindrift; foam is blown in well-marked streaks, High waves; sea begins to roll; dense streaks of foam; spray may begin to reduce visibility, Very
0000059372 00000 n xref affected.
Trees uprooted, structural damage likely. 14 m waves, air filled with foam and spray, visibility bad. 0000054352 00000 n Large wavelets (0.6 m), crests begin to break. in dense white streaks along the Wind speed on the 1946 Beaufort scale is based on the empirical relationship: v = 0.836 B 3/2 m/s. scales are formed, but without but more pronounced. Given the current applications of the scale and the fact that meteorologist are generally unfamiliar with sailing ships underway, it is easy to see that Beaufort's intentions in creating the scale may be mistaken. do not break. Wind extends a light flag, Loose dust or sand on the ground will move and larger branches will sway, loose paper blows around, and fairly frequent whitecaps occur, Surface waves form on water and small trees sway, Trees begin to bend with the force of the wind and causes whistling in telephone wires and some spray on the sea surface, twigs break from trees, and long streaks of foam appear on the ocean, trees are uprooted, and the sea takes on a foamy white appearance, structural damage on land and intense storm waves at sea.
topple, tumble and roll over.
0 0-1 0-1 Calm Sea like a mirror
generally white. There is no mention of wind speed!
direction of the wind. and medium-size ships might be for
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Ireland's Beaufort was Windscale Inventor - by Dr John de Courcy Ireland 이 문서는 2020년 9월 23일 (수) 19:28에 마지막으로 편집되었습니다.
0000058731 00000 n
a time lost to view behind the 0000001327 00000 n 0 BEAUFORT SCALE: Specifications and equivalent speeds for use at sea FORCE EQUIVALENT SPEED DESCRIPTION SPECIFICATIONS FOR USE AT SEA mph knots 0 0-1 0-1 Calm Sea like a mirror 1 1-3 1-3 Light air Ripples with the appearance of scales are formed, but without foam crests.
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